Pipe-threading machine.



2 is a side elevation of the devicewit-h SAMUEL'M'. 'STOUGH.A3IIJ.HARRY C. LARICK, OF FRANKFORT, INDIANA.

PIPE-THREADING MACHINE.

Specification of Letterslatent.

Patented Aug. 13, 1912.

Application filed December 27, 1911. Serial No. 668,041.

To all whom it may concern:

Be it known that we, SAMUEL M: S'rouon, and HARRY C. Lennon, citizens of'the United States, residing at- Frankfort, in the county of Clinton and State of Indiana, have invented certain new and useful Improvements in Pipe-Threading Machines, of which the following is aspecification.

This invention relates to expanding dies for cutting tapered threads upon pipes and has for the principal object to provide an elongated sliding eccentric for each die of a revoluble head having a tapered bore, the eccentric having a curved outer face of considerable length and slightly beveled to conforinto the bore of the head, this construction presenting a wear surface of considerable area bet-ween.-the parts so that-scouring of the head, as in ordinary devices where the dies themselves bear against the head, is positively obviated.

A further object of the invention is to provide novel means for simultaneously adjusting all of the dies in position for cutting threads on various sizes of pipes.

:With the above mentionedob'ects in view the invention consists of certain novel details of construction and combination of parts hereinafter fully described and claimed, it being, understood that various. .modifications may be made in the mlnor details of construction within the scope of the appended claims.

In the accompanying drawings forming part of this. specification Figure 1 is a front elevation of our improved device. Fig. parts in section. Fig. 3 is a fragmentary sectional view taken on the line 3+3 Fig. .1. Fig. 4 is a fragmentary sectional View taken on the line 44 Fig. 1. Fig. 5 is adetail perspective view of an eccentric with the related die attached.

Referring now to-the' drawings in which like characters of reference designate similar parts, 10 designates. a pipe upon which a tapered thread is to be out, which pipe passes through andis secured to the work holder 11 by means ofyset screws 12, the work holder ll is of a hollow substantially cylindrical shape and is interiorly threaded to receive .the exteriorly threaded end. of a hollow, cylindrical body- 13 which termi- .nates remote from its threaded-end in aperipheral flange 14.

with a flange 16 which bears against the 17 that surrounds the body 13 and is revolubly mounted-thereupon. For rotating the head, a.ring 18 is snugly fitted upon the nipple andis provided with handle sockets 19, a set screw 20'being engaged through the ring and binding against the nipple. The bore 21 of the revoluble head is tapered from the inner end toward the outer end, that is, is of less diameter at. the outer end than 'attheinner end.

The body 13 is internally threaded to receive a substantially cylindrical hollow die carrier. 22, the die carrier being provided near the outer end with a peripheral flange 23 having outwardly projecting tongues 24 on the edge which engage in notches 25 formed in the bore of the head and secure the'die carrier against rotation in the latter, the'die carrier being movable longitudi nally in thebody 13 by virtue of the screw thread connection therewith, during rotation of the head.

A plurality of dies 26, preferably four in number, are seated in recesses 27 formed in the outer edge of the die carrier, these dies'being adapted for sliding movement on the outer face of the'die carrier flange 23, there being guide lugs 28 seated on said flange on opposite sides of each die to direct the sliding movements thereof. Each die is provided. on the upper outer corner with a downwardly opening hook 29.

Slidably fitted on the outer face of the die carrier flange 23 is. a plurality of eccentrics 30, one for each die, each .eccentric being provided witha curved outer edge 31 which bears throughout its length upon the inner wall of the revoluble head and is beveled to conform .to thetaper of the wall. ,The eccentric is .furthermore provided with a curved inner edge of less radius of .curva-. ture than the outeredge. so that both edges meet in a point as. shown at 32,'there being an upstanding rib '33 formed on. said curved inner eigeto fit in the downwardly ,op'ening hoo of the related die.

By referring. to Fig. 1 it'will" be noted that theeccentrics are of such length that their. confronting terminals contact, this ,great len h of' the eccentrics presenting wear sur aces of considerable area to the flange 14 and which terminates in aanipple inner wall of the head so that as the eccentrics are moved radially by the dies as the die carrier advances in the body during the thread cutting operation, there will be no tendency for the inner wall of the head ,to be scoured or mutilated as invariably happens when the dies themselves bear upon the wall as -in ordinary devices of this character. Furthermore, it will be noted that the eccentrics perform a two-fold function. Located as they are between the butt ends ofthe dies and the tapered wall of the head and being slidably connected to the dies, they not only control the recession of the dies in cooperation with the tapered wall of the head during the rotation of the latter, but are also adapted to be rotated or shifted to adjust the dies radially relative to the pipe being threaded.

For retaining the eccentrics and dies in place, and for simultaneously moving the eccentrics so as to adjust the dies to cutting position on various sizes of pipes, we provide a slide ring 34: which bears upon the outer faces of the eccentrics and dies and is held in this position through the instrumentality of a cylindrical nut 35 having a flange 36 which bears upon the outer face of the ring, the nut being threaded on to the" outer end of the chuck as shown at 37. The slide ring is provided on the inner face with lugs 38 which bear against the butt ends of the eccentrics, and serve to rotate the latter counter-clockwise during counterclockwise rotation of the, slide ring, and furthermore the latter is provided in the edges with slots 39 which receive pins 40 carried by the eccentrics, this connection between the parts serving to rotate the eccentrics clock-wise during a clockwise rotation of the slide ring. Grips 41 are arranged on the outer face of the slide ring for manipulating the same.

What is claimed, is a 1. A thread cutting toolincluding a head having a tapered bore, a radially movabledie in said bore, means for moving said die longitudinally of said bore, and an elongated radially movable eccentric slidably connected to said die and having a curved outer edge bearing upon the wall of said bore.

2. A thread cutting tool including a head having a tapered bore, a radially movable die in said bore, means for moving said die longitudinally of said bore, and a radially movable eccentric having an outer curved edge conforming to the wall of said bore, and having an lnner curved edge eccentrically disposed to said outer edge and slidably connected to said die.

3. A thread cutting tool including a head having a tapered bore, a radially disposed radially movable die in said'bore, means for moving said, die longitudinally of? said bore,

a head having ataperedbore, a plurality of radially movable dies in said bore, means carrying said dies and serving to move the dies longitudinally of said bore, radially.

moyable eccentrics disposed transversely across the outer ends of said dies, each eccentric having an outer curved edge hearing upon the wall of said bore and having an inner curved edge eccentrically disposed to said outer edge and equipped with means for securing the related die for sliding movement thereupon, and means for simultaneously rotating said eccentrics about the arms of said bore whereby to adjust said dies.

5. A thread cutting tool including astationary body, a revoluble head thereon having a tapered bore, a die carrier movable longitudinally through said body and secured for simultaneous rotation with said head, a radially movable die carried by said die carrier, and an elongated radially movable eccentric having a curved outer edge bearing upon the wall of said bore, and hav ing a curved inner edge disposed eccentrically to said outer edge and having a projection interfitting with the outer end of said die and serving to slidably attach the die to the eccentric.

6. A die cutting tool including a stationary body, a revoluble head thereon having a tapered bore, a die carrier movable longitudinally through said body and having a flange non-rotatably and slidably connected of said bore, and having an inner curved rib. eccentrically disposed to said outer edge and slidably securing the related die, and a slide ring retaining said eccentrics and said dies on said flange and having means for simultaneously rotating said eccentrics about the axis of said bore.

7. In a pipe threading machine, the com bination with a holder for the pipe, of a he ad rotating relative thereto and provided with a bore, a die carrier movable in the head, a plurality of dies movably mounted in the carrier, and a series of independent segmental members slidably engaging said dies and adapted to be rotated to adjust the dies relative to the pipe and designed to move longitudinally "with the carrier and to bear against the wall of the bore of the head responsive to the thrust of the dies whereby the recession of the dies is controlled.

8. In a pipe threading machine, the combination with a holder for the pipe, of a head rotating relative thereto and provided with a bore, a die carrier movable longitudinally of the head, a die movably mounted in the carrier, and an element movably connected to the die and adapted to berotated to adjust the latter radially relative to the. I pipe being cut, and designed to move longiv tudinally with the carrier and to bear against the wall of the bore of the head responsive to the thrust of the (lie whereby the recession of the die in its longitudinal movement is controlled.

9. In a pipe threading machine, the combination with a holder for the pipe, of a rotary head having a tapered bore, a plurality of radially disposed and radially movable dies mounted in the carrier, and an eccentric segmental member for each die, said members being arranged end to end and normally bearing against the Wall of the bore of the head responsive to the end thrust of the dies while at work whereby the recession of the dies is controlled. said segmental members being adapted to be rotatably shifted to adjust the dies radially.

10. In a pipe threading machine, the combination with a support for the pipe, of a rotatable head having a tapered bore, a radially movable die, means for moving the (lie longitudinally of the bore and an element slidably connected to the die at its inner edge, the outer edge of said element bearing against the wall of the bore thus controlling the recession of the die when the latter is moved longitudinally, and means for shifting the element to radially adjust the die.

In testimony whereof we afiix our signatures, in the presence of witnesses.

SAMUEL M. STOUGH.

HARRY C. LARICK.

\Vitnesscs SAMUEL M. HUNSICKER, CHRISTIAN I-IAUBER, FRANCIS BOYLE, H. ELLIs OHANDLEE. 

